Balances and Changes in Amount of Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2012
Goodwill [Line Items]
Goodwill, Beginning Balance		$ 112,450	$ 104,241
2013 Impairment charge related to the adjusted fair value of the Platforms and Applications reporting unit	(86,332)	(8,209)
Goodwill, Ending Balance		104,241	104,241
Commercial Segment
Goodwill [Line Items]
Goodwill, Beginning Balance		58,154	49,945
2013 Impairment charge related to the adjusted fair value of the Platforms and Applications reporting unit		(8,209)
Goodwill, Ending Balance		49,945	49,945
Government Segment
Goodwill [Line Items]
Goodwill, Beginning Balance			54,296	54,296
Goodwill, Ending Balance		$ 54,296	$ 54,296	$ 54,296